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bad56603ba
freebsd-dev/sys/kern/vfs_syscalls.c
Jeff Roberson a59f8b9e6c Turn #ifdef LOOKUP_SHARED into #ifndef LOOKUP_EXCLUSIVE to enable this 
behavior by default.  Also, change the options line to reflect this.

If there are no problems reported this will become the only behavior and the
knob will be removed in a month or so.

Demanded by:	obrien
2002-04-09 05:14:17 +00:00

4844 lines
106 KiB
C
Raw Blame History

/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
* $FreeBSD$
*/
/* For 4.3 integer FS ID compatibility */
#include "opt_compat.h"
#include "opt_ffs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/sysent.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/sysproto.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/linker.h>
#include <sys/stat.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/extattr.h>
#include <sys/jail.h>
#include <sys/sysctl.h>
#include <machine/limits.h>
#include <machine/stdarg.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/uma.h>
static int change_dir(struct nameidata *ndp, struct thread *td);
static void checkdirs(struct vnode *olddp, struct vnode *newdp);
static int chroot_refuse_vdir_fds(struct filedesc *fdp);
static int getutimes(const struct timeval *, struct timespec *);
static int setfown(struct thread *td, struct vnode *, uid_t, gid_t);
static int setfmode(struct thread *td, struct vnode *, int);
static int setfflags(struct thread *td, struct vnode *, int);
static int setutimes(struct thread *td, struct vnode *,
const struct timespec *, int);
static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred,
struct thread *td);
static void vfs_freeopts(struct vfsoptlist *opt);
static int vfs_nmount(struct thread *td, int, struct uio *);
static int usermount = 0; /* if 1, non-root can mount fs. */
int (*union_dircheckp)(struct thread *td, struct vnode **, struct file *);
SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
/*
* Virtual File System System Calls
*/
#ifndef _SYS_SYSPROTO_H_
struct nmount_args {
struct iovec *iovp;
unsigned int iovcnt;
int flags;
};
#endif
/* ARGSUSED */
int
nmount(td, uap)
struct thread *td;
struct nmount_args /* {
syscallarg(struct iovec *) iovp;
syscallarg(unsigned int) iovcnt;
syscallarg(int) flags;
} */ *uap;
{
struct uio auio;
struct iovec *iov, *needfree;
struct iovec aiov[UIO_SMALLIOV];
long error, i;
u_int iovlen, iovcnt;
iovcnt = SCARG(uap, iovcnt);
iovlen = iovcnt * sizeof (struct iovec);
/*
* Check that we have an even number of iovec's
* and that we have at least two options.
*/
if ((iovcnt & 1) || (iovcnt < 4) || (iovcnt > UIO_MAXIOV))
return (EINVAL);
if (iovcnt > UIO_SMALLIOV) {
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else {
iov = aiov;
needfree = NULL;
}
auio.uio_iov = iov;
auio.uio_iovcnt = iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_offset = 0;
auio.uio_resid = 0;
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
goto finish;
for (i = 0; i < iovcnt; i++) {
if (iov->iov_len > INT_MAX - auio.uio_resid) {
error = EINVAL;
goto finish;
}
auio.uio_resid += iov->iov_len;
iov++;
}
error = vfs_nmount(td, SCARG(uap, flags), &auio);
finish:
if (needfree != NULL)
free(needfree, M_TEMP);
return (error);
}
/*
* Release all resources related to the
* mount options.
*/
static void
vfs_freeopts(struct vfsoptlist *opt)
{
free(opt->opt, M_MOUNT);
free(opt->optbuf, M_MOUNT);
free(opt, M_MOUNT);
}
int
kernel_mount(iovp, iovcnt, flags)
struct iovec *iovp;
unsigned int iovcnt;
int flags;
{
struct uio auio;
struct iovec *iov;
int error, i;
/*
* Check that we have an even number of iovec's
* and that we have at least two options.
*/
if ((iovcnt & 1) || (iovcnt < 4))
return (EINVAL);
auio.uio_iov = iovp;
auio.uio_iovcnt = iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_offset = 0;
auio.uio_td = NULL;
auio.uio_resid = 0;
iov = iovp;
for (i = 0; i < iovcnt; i++) {
if (iov->iov_len > INT_MAX - auio.uio_resid) {
return (EINVAL);
}
auio.uio_resid += iov->iov_len;
iov++;
}
error = vfs_nmount(curthread, flags, &auio);
return (error);
}
int
kernel_vmount(int flags, ...)
{
struct iovec *iovp;
struct uio auio;
va_list ap;
unsigned int iovcnt, iovlen, len;
const char *cp;
char *buf, *pos;
size_t n;
int error, i;
len = 0;
va_start(ap, flags);
for (iovcnt = 0; (cp = va_arg(ap, const char *)) != NULL; iovcnt++)
len += strlen(cp) + 1;
va_end(ap);
if (iovcnt < 4 || iovcnt & 1)
return (EINVAL);
iovlen = iovcnt * sizeof (struct iovec);
MALLOC(iovp, struct iovec *, iovlen, M_MOUNT, M_WAITOK);
MALLOC(buf, char *, len, M_MOUNT, M_WAITOK);
pos = buf;
va_start(ap, flags);
for (i = 0; i < iovcnt; i++) {
cp = va_arg(ap, const char *);
copystr(cp, pos, len - (pos - buf), &n);
iovp[i].iov_base = pos;
iovp[i].iov_len = n;
pos += n;
}
va_end(ap);
auio.uio_iov = iovp;
auio.uio_iovcnt = iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_offset = 0;
auio.uio_td = NULL;
auio.uio_resid = len;
error = vfs_nmount(curthread, flags, &auio);
FREE(iovp, M_MOUNT);
FREE(buf, M_MOUNT);
return (error);
}
/*
* vfs_nmount(): actually attempt a filesystem mount.
*/
static int
vfs_nmount(td, fsflags, fsoptions)
struct thread *td;
int fsflags; /* Flags common to all filesystems. */
struct uio *fsoptions; /* Options local to the filesystem. */
{
linker_file_t lf;
struct vnode *vp;
struct mount *mp;
struct vfsconf *vfsp;
struct iovec *cur;
struct vfsoptlist *optlist;
struct vfsopt *opt;
char *buf, *fstype, *fspath;
int error, flag = 0, kern_flag = 0, i, len, optcnt;
int offset, iovcnt, fstypelen, fspathlen;
struct vattr va;
struct nameidata nd;
/*
* Allocate memory to hold the vfsopt structures.
*/
iovcnt = fsoptions->uio_iovcnt;
optcnt = iovcnt >> 1;
opt = malloc(sizeof (struct vfsopt) * optcnt,
M_MOUNT, M_WAITOK | M_ZERO);
/*
* Count the size of the buffer for options,
* allocate it, and fill in the vfsopt structures.
*/
cur = fsoptions->uio_iov;
len = fsoptions->uio_resid;
buf = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
optlist = malloc(sizeof (struct vfsoptlist), M_MOUNT, M_WAITOK);
optlist->opt = opt;
optlist->optbuf = buf;
optlist->optcnt = optcnt;
offset = i = 0;
cur = fsoptions->uio_iov;
while (i < optcnt) {
opt[i].name = buf + offset;
/* Ensure the name of an option is a string. */
if (opt[i].name[cur->iov_len - 1] != '\0') {
error = EINVAL;
goto bad;
}
offset += cur->iov_len;
cur++;
opt[i].len = cur->iov_len;
/*
* Prevent consumers from trying to
* read the value of a 0 length option
* by setting it to NULL.
*/
if (opt[i].len == 0)
opt[i].value = NULL;
else
opt[i].value = buf + offset;
offset += cur->iov_len;
cur++; i++;
}
if ((error = uiomove(buf, len, fsoptions)) != 0)
goto bad;
/*
* We need these two options before the others,
* and they are mandatory for any filesystem.
* Ensure they are NULL terminated as well.
*/
fstypelen = 0;
error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
if (error || fstype[fstypelen - 1] != '\0') {
error = EINVAL;
goto bad;
}
fspathlen = 0;
error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
if (error || fspath[fspathlen - 1] != '\0') {
error = EINVAL;
goto bad;
}
/*
* Be ultra-paranoid about making sure the type and fspath
* variables will fit in our mp buffers, including the
* terminating NUL.
*/
if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
error = ENAMETOOLONG;
goto bad;
}
if (usermount == 0) {
error = suser(td);
if (error)
goto bad;
}
/*
* Do not allow NFS export by non-root users.
*/
if (fsflags & MNT_EXPORTED) {
error = suser(td);
if (error)
goto bad;
}
/*
* Silently enforce MNT_NOSUID and MNT_NODEV for non-root users.
*/
if (suser(td))
fsflags |= MNT_NOSUID | MNT_NODEV;
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, td);
if ((error = namei(&nd)) != 0)
goto bad;
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (fsflags & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
error = EINVAL;
goto bad;
}
mp = vp->v_mount;
flag = mp->mnt_flag;
kern_flag = mp->mnt_kern_flag;
/*
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only.
*/
if ((fsflags & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
vput(vp);
error = EOPNOTSUPP; /* Needs translation */
goto bad;
}
/*
* Only root, or the user that did the original mount is
* permitted to update it.
*/
if (mp->mnt_stat.f_owner != td->td_ucred->cr_uid) {
error = suser(td);
if (error) {
vput(vp);
goto bad;
}
}
if (vfs_busy(mp, LK_NOWAIT, 0, td)) {
vput(vp);
error = EBUSY;
goto bad;
}
mtx_lock(&vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 || vp->v_mountedhere != NULL) {
mtx_unlock(&vp->v_interlock);
vfs_unbusy(mp, td);
vput(vp);
error = EBUSY;
goto bad;
}
vp->v_flag |= VMOUNT;
mtx_unlock(&vp->v_interlock);
mp->mnt_flag |= fsflags &
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT);
VOP_UNLOCK(vp, 0, td);
mp->mnt_optnew = optlist;
goto update;
}
/*
* If the user is not root, ensure that they own the directory
* onto which we are attempting to mount.
*/
error = VOP_GETATTR(vp, &va, td->td_ucred, td);
if (error) {
vput(vp);
goto bad;
}
if (va.va_uid != td->td_ucred->cr_uid) {
error = suser(td);
if (error) {
vput(vp);
goto bad;
}
}
if ((error = vinvalbuf(vp, V_SAVE, td->td_ucred, td, 0, 0)) != 0) {
vput(vp);
goto bad;
}
if (vp->v_type != VDIR) {
vput(vp);
error = ENOTDIR;
goto bad;
}
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstype))
break;
if (vfsp == NULL) {
/* Only load modules for root (very important!). */
error = suser(td);
if (error) {
vput(vp);
goto bad;
}
error = securelevel_gt(td->td_ucred, 0);
if (error) {
vput(vp);
goto bad;
}
error = linker_load_file(fstype, &lf);
if (error || lf == NULL) {
vput(vp);
if (lf == NULL)
error = ENODEV;
goto bad;
}
lf->userrefs++;
/* Look up again to see if the VFS was loaded. */
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstype))
break;
if (vfsp == NULL) {
lf->userrefs--;
linker_file_unload(lf);
vput(vp);
error = ENODEV;
goto bad;
}
}
mtx_lock(&vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 ||
vp->v_mountedhere != NULL) {
mtx_unlock(&vp->v_interlock);
vput(vp);
error = EBUSY;
goto bad;
}
vp->v_flag |= VMOUNT;
mtx_unlock(&vp->v_interlock);
/*
* Allocate and initialize the filesystem.
*/
mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO);
TAILQ_INIT(&mp->mnt_nvnodelist);
TAILQ_INIT(&mp->mnt_reservedvnlist);
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE);
(void)vfs_busy(mp, LK_NOWAIT, 0, td);
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_vfc = vfsp;
vfsp->vfc_refcount++;
mp->mnt_stat.f_type = vfsp->vfc_typenum;
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
strncpy(mp->mnt_stat.f_fstypename, fstype, MFSNAMELEN);
mp->mnt_vnodecovered = vp;
mp->mnt_stat.f_owner = td->td_ucred->cr_uid;
strncpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
mp->mnt_iosize_max = DFLTPHYS;
VOP_UNLOCK(vp, 0, td);
mp->mnt_opt = optlist;
update:
/*
* Check if the fs implements the new VFS_NMOUNT()
* function, since the new system call was used.
*/
if (mp->mnt_op->vfs_mount != NULL) {
printf("%s doesn't support the new mount syscall\n",
mp->mnt_vfc->vfc_name);
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
if (mp->mnt_flag & MNT_UPDATE)
vfs_unbusy(mp, td);
else {
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, td);
free((caddr_t)mp, M_MOUNT);
}
vput(vp);
error = EOPNOTSUPP;
goto bad;
}
/*
* Set the mount level flags.
*/
if (fsflags & MNT_RDONLY)
mp->mnt_flag |= MNT_RDONLY;
else if (mp->mnt_flag & MNT_RDONLY)
mp->mnt_kern_flag |= MNTK_WANTRDWR;
mp->mnt_flag &=~ MNT_UPDATEMASK;
mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE);
/*
* Mount the filesystem.
* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
* get. No freeing of cn_pnbuf.
*/
error = VFS_NMOUNT(mp, &nd, td);
if (mp->mnt_flag & MNT_UPDATE) {
if (mp->mnt_kern_flag & MNTK_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
mp->mnt_flag &=~
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT);
mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
if (error) {
mp->mnt_flag = flag;
mp->mnt_kern_flag = kern_flag;
vfs_freeopts(mp->mnt_optnew);
} else {
vfs_freeopts(mp->mnt_opt);
mp->mnt_opt = mp->mnt_optnew;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
if (mp->mnt_syncer == NULL)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp, td);
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
vrele(vp);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
struct vnode *newdp;
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
vp->v_mountedhere = mp;
mtx_unlock(&vp->v_interlock);
mtx_lock(&mountlist_mtx);
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mtx_unlock(&mountlist_mtx);
if (VFS_ROOT(mp, &newdp))
panic("mount: lost mount");
checkdirs(vp, newdp);
vput(newdp);
VOP_UNLOCK(vp, 0, td);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp, td);
if ((error = VFS_START(mp, 0, td)) != 0) {
vrele(vp);
goto bad;
}
} else {
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, td);
free((caddr_t)mp, M_MOUNT);
vput(vp);
goto bad;
}
return (0);
bad:
vfs_freeopts(optlist);
return (error);
}
/*
* Old Mount API.
*/
#ifndef _SYS_SYSPROTO_H_
struct mount_args {
char *type;
char *path;
int flags;
caddr_t data;
};
#endif
/* ARGSUSED */
int
mount(td, uap)
struct thread *td;
struct mount_args /* {
syscallarg(char *) type;
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(caddr_t) data;
} */ *uap;
{
char *fstype;
char *fspath;
int error;
fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
fspath = malloc(MNAMELEN, M_TEMP, M_WAITOK);
/*
* vfs_mount() actually takes a kernel string for `type' and
* `path' now, so extract them.
*/
error = copyinstr(SCARG(uap, type), fstype, MFSNAMELEN, NULL);
if (error)
goto finish;
error = copyinstr(SCARG(uap, path), fspath, MNAMELEN, NULL);
if (error)
goto finish;
error = vfs_mount(td, fstype, fspath, SCARG(uap, flags),
SCARG(uap, data));
finish:
free(fstype, M_TEMP);
free(fspath, M_TEMP);
return (error);
}
/*
* vfs_mount(): actually attempt a filesystem mount.
*
* This routine is designed to be a "generic" entry point for routines
* that wish to mount a filesystem. All parameters except `fsdata' are
* pointers into kernel space. `fsdata' is currently still a pointer
* into userspace.
*/
int
vfs_mount(td, fstype, fspath, fsflags, fsdata)
struct thread *td;
const char *fstype;
char *fspath;
int fsflags;
void *fsdata;
{
linker_file_t lf;
struct vnode *vp;
struct mount *mp;
struct vfsconf *vfsp;
int error, flag = 0, kern_flag = 0;
struct vattr va;
struct nameidata nd;
/*
* Be ultra-paranoid about making sure the type and fspath
* variables will fit in our mp buffers, including the
* terminating NUL.
*/
if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
return (ENAMETOOLONG);
if (usermount == 0) {
error = suser(td);
if (error)
return (error);
}
/*
* Do not allow NFS export by non-root users.
*/
if (fsflags & MNT_EXPORTED) {
error = suser(td);
if (error)
return (error);
}
/*
* Silently enforce MNT_NOSUID and MNT_NODEV for non-root users.
*/
if (suser(td))
fsflags |= MNT_NOSUID | MNT_NODEV;
/*
* Get vnode to be covered
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (fsflags & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
mp = vp->v_mount;
flag = mp->mnt_flag;
kern_flag = mp->mnt_kern_flag;
/*
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only.
*/
if ((fsflags & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
vput(vp);
return (EOPNOTSUPP); /* Needs translation */
}
/*
* Only root, or the user that did the original mount is
* permitted to update it.
*/
if (mp->mnt_stat.f_owner != td->td_ucred->cr_uid) {
error = suser(td);
if (error) {
vput(vp);
return (error);
}
}
if (vfs_busy(mp, LK_NOWAIT, 0, td)) {
vput(vp);
return (EBUSY);
}
mtx_lock(&vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 || vp->v_mountedhere != NULL) {
mtx_unlock(&vp->v_interlock);
vfs_unbusy(mp, td);
vput(vp);
return (EBUSY);
}
vp->v_flag |= VMOUNT;
mtx_unlock(&vp->v_interlock);
mp->mnt_flag |= fsflags &
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT);
VOP_UNLOCK(vp, 0, td);
goto update;
}
/*
* If the user is not root, ensure that they own the directory
* onto which we are attempting to mount.
*/
error = VOP_GETATTR(vp, &va, td->td_ucred, td);
if (error) {
vput(vp);
return (error);
}
if (va.va_uid != td->td_ucred->cr_uid) {
error = suser(td);
if (error) {
vput(vp);
return (error);
}
}
if ((error = vinvalbuf(vp, V_SAVE, td->td_ucred, td, 0, 0)) != 0) {
vput(vp);
return (error);
}
if (vp->v_type != VDIR) {
vput(vp);
return (ENOTDIR);
}
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstype))
break;
if (vfsp == NULL) {
/* Only load modules for root (very important!). */
error = suser(td);
if (error) {
vput(vp);
return (error);
}
error = securelevel_gt(td->td_ucred, 0);
if (error) {
vput(vp);
return (error);
}
error = linker_load_file(fstype, &lf);
if (error || lf == NULL) {
vput(vp);
if (lf == NULL)
error = ENODEV;
return (error);
}
lf->userrefs++;
/* Look up again to see if the VFS was loaded. */
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstype))
break;
if (vfsp == NULL) {
lf->userrefs--;
linker_file_unload(lf);
vput(vp);
return (ENODEV);
}
}
mtx_lock(&vp->v_interlock);
if ((vp->v_flag & VMOUNT) != 0 ||
vp->v_mountedhere != NULL) {
mtx_unlock(&vp->v_interlock);
vput(vp);
return (EBUSY);
}
vp->v_flag |= VMOUNT;
mtx_unlock(&vp->v_interlock);
/*
* Allocate and initialize the filesystem.
*/
mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO);
TAILQ_INIT(&mp->mnt_nvnodelist);
TAILQ_INIT(&mp->mnt_reservedvnlist);
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE);
(void)vfs_busy(mp, LK_NOWAIT, 0, td);
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_vfc = vfsp;
vfsp->vfc_refcount++;
mp->mnt_stat.f_type = vfsp->vfc_typenum;
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
strncpy(mp->mnt_stat.f_fstypename, fstype, MFSNAMELEN);
mp->mnt_vnodecovered = vp;
mp->mnt_stat.f_owner = td->td_ucred->cr_uid;
strncpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
mp->mnt_iosize_max = DFLTPHYS;
VOP_UNLOCK(vp, 0, td);
update:
/*
* Check if the fs implements the old VFS_MOUNT()
* function, since the old system call was used.
*/
if (mp->mnt_op->vfs_mount == NULL) {
printf("%s doesn't support the old mount syscall\n",
mp->mnt_vfc->vfc_name);
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
if (mp->mnt_flag & MNT_UPDATE)
vfs_unbusy(mp, td);
else {
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, td);
free((caddr_t)mp, M_MOUNT);
}
vput(vp);
return (EOPNOTSUPP);
}
/*
* Set the mount level flags.
*/
if (fsflags & MNT_RDONLY)
mp->mnt_flag |= MNT_RDONLY;
else if (mp->mnt_flag & MNT_RDONLY)
mp->mnt_kern_flag |= MNTK_WANTRDWR;
mp->mnt_flag &=~ MNT_UPDATEMASK;
mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE);
/*
* Mount the filesystem.
* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
* get. No freeing of cn_pnbuf.
*/
error = VFS_MOUNT(mp, fspath, fsdata, &nd, td);
if (mp->mnt_flag & MNT_UPDATE) {
if (mp->mnt_kern_flag & MNTK_WANTRDWR)
mp->mnt_flag &= ~MNT_RDONLY;
mp->mnt_flag &=~
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT);
mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
if (error) {
mp->mnt_flag = flag;
mp->mnt_kern_flag = kern_flag;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
if (mp->mnt_syncer == NULL)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp, td);
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
vrele(vp);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
/*
* Put the new filesystem on the mount list after root.
*/
cache_purge(vp);
if (!error) {
struct vnode *newdp;
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
vp->v_mountedhere = mp;
mtx_unlock(&vp->v_interlock);
mtx_lock(&mountlist_mtx);
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mtx_unlock(&mountlist_mtx);
if (VFS_ROOT(mp, &newdp))
panic("mount: lost mount");
checkdirs(vp, newdp);
vput(newdp);
VOP_UNLOCK(vp, 0, td);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
error = vfs_allocate_syncvnode(mp);
vfs_unbusy(mp, td);
if ((error = VFS_START(mp, 0, td)) != 0)
vrele(vp);
} else {
mtx_lock(&vp->v_interlock);
vp->v_flag &= ~VMOUNT;
mtx_unlock(&vp->v_interlock);
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, td);
free((caddr_t)mp, M_MOUNT);
vput(vp);
}
return (error);
}
/*
* Scan all active processes to see if any of them have a current
* or root directory of `olddp'. If so, replace them with the new
* mount point.
*/
static void
checkdirs(olddp, newdp)
struct vnode *olddp, *newdp;
{
struct filedesc *fdp;
struct proc *p;
int nrele;
if (olddp->v_usecount == 1)
return;
sx_slock(&allproc_lock);
LIST_FOREACH(p, &allproc, p_list) {
PROC_LOCK(p);
fdp = p->p_fd;
if (fdp == NULL) {
PROC_UNLOCK(p);
continue;
}
nrele = 0;
FILEDESC_LOCK(fdp);
if (fdp->fd_cdir == olddp) {
VREF(newdp);
fdp->fd_cdir = newdp;
nrele++;
}
if (fdp->fd_rdir == olddp) {
VREF(newdp);
fdp->fd_rdir = newdp;
nrele++;
}
FILEDESC_UNLOCK(fdp);
PROC_UNLOCK(p);
while (nrele--)
vrele(olddp);
}
sx_sunlock(&allproc_lock);
if (rootvnode == olddp) {
vrele(rootvnode);
VREF(newdp);
rootvnode = newdp;
}
}
/*
* Unmount a file system.
*
* Note: unmount takes a path to the vnode mounted on as argument,
* not special file (as before).
*/
#ifndef _SYS_SYSPROTO_H_
struct unmount_args {
char *path;
int flags;
};
#endif
/* ARGSUSED */
int
unmount(td, uap)
struct thread *td;
register struct unmount_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap;
{
register struct vnode *vp;
struct mount *mp;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
mp = vp->v_mount;
/*
* Only root, or the user that did the original mount is
* permitted to unmount this filesystem.
*/
if (mp->mnt_stat.f_owner != td->td_ucred->cr_uid) {
error = suser(td);
if (error) {
vput(vp);
return (error);
}
}
/*
* Don't allow unmounting the root file system.
*/
if (mp->mnt_flag & MNT_ROOTFS) {
vput(vp);
return (EINVAL);
}
/*
* Must be the root of the filesystem
*/
if ((vp->v_flag & VROOT) == 0) {
vput(vp);
return (EINVAL);
}
vput(vp);
return (dounmount(mp, SCARG(uap, flags), td));
}
/*
* Do the actual file system unmount.
*/
int
dounmount(mp, flags, td)
struct mount *mp;
int flags;
struct thread *td;
{
struct vnode *coveredvp, *fsrootvp;
int error;
int async_flag;
mtx_lock(&mountlist_mtx);
mp->mnt_kern_flag |= MNTK_UNMOUNT;
error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK |
((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &mountlist_mtx, td);
if (error) {
mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
return (error);
}
vn_start_write(NULL, &mp, V_WAIT);
if (mp->mnt_flag & MNT_EXPUBLIC)
vfs_setpublicfs(NULL, NULL, NULL);
vfs_msync(mp, MNT_WAIT);
async_flag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &=~ MNT_ASYNC;
cache_purgevfs(mp); /* remove cache entries for this file sys */
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
/* Move process cdir/rdir refs on fs root to underlying vnode. */
if (VFS_ROOT(mp, &fsrootvp) == 0) {
if (mp->mnt_vnodecovered != NULL)
checkdirs(fsrootvp, mp->mnt_vnodecovered);
if (fsrootvp == rootvnode) {
vrele(rootvnode);
rootvnode = NULL;
}
vput(fsrootvp);
}
if (((mp->mnt_flag & MNT_RDONLY) ||
(error = VFS_SYNC(mp, MNT_WAIT, td->td_ucred, td)) == 0) ||
(flags & MNT_FORCE)) {
error = VFS_UNMOUNT(mp, flags, td);
}
vn_finished_write(mp);
if (error) {
/* Undo cdir/rdir and rootvnode changes made above. */
if (VFS_ROOT(mp, &fsrootvp) == 0) {
if (mp->mnt_vnodecovered != NULL)
checkdirs(mp->mnt_vnodecovered, fsrootvp);
if (rootvnode == NULL) {
rootvnode = fsrootvp;
vref(rootvnode);
}
vput(fsrootvp);
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL)
(void) vfs_allocate_syncvnode(mp);
mtx_lock(&mountlist_mtx);
mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
mp->mnt_flag |= async_flag;
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK,
&mountlist_mtx, td);
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
return (error);
}
mtx_lock(&mountlist_mtx);
TAILQ_REMOVE(&mountlist, mp, mnt_list);
if ((coveredvp = mp->mnt_vnodecovered) != NULL)
coveredvp->v_mountedhere = NULL;
mp->mnt_vfc->vfc_refcount--;
if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
panic("unmount: dangling vnode");
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_mtx, td);
lockdestroy(&mp->mnt_lock);
if (coveredvp != NULL)
vrele(coveredvp);
if (mp->mnt_kern_flag & MNTK_MWAIT)
wakeup((caddr_t)mp);
if (mp->mnt_op->vfs_mount == NULL)
vfs_freeopts(mp->mnt_opt);
free((caddr_t)mp, M_MOUNT);
return (0);
}
/*
* Sync each mounted filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct sync_args {
int dummy;
};
#endif
#ifdef DEBUG
static int syncprt = 0;
SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
#endif
/* ARGSUSED */
int
sync(td, uap)
struct thread *td;
struct sync_args *uap;
{
struct mount *mp, *nmp;
int asyncflag;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
asyncflag = mp->mnt_flag & MNT_ASYNC;
mp->mnt_flag &= ~MNT_ASYNC;
vfs_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT,
((td != NULL) ? td->td_ucred : NOCRED), td);
mp->mnt_flag |= asyncflag;
vn_finished_write(mp);
}
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
mtx_unlock(&mountlist_mtx);
#if 0
/*
* XXX don't call vfs_bufstats() yet because that routine
* was not imported in the Lite2 merge.
*/
#ifdef DIAGNOSTIC
if (syncprt)
vfs_bufstats();
#endif /* DIAGNOSTIC */
#endif
return (0);
}
/* XXX PRISON: could be per prison flag */
static int prison_quotas;
#if 0
SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, "");
#endif
/*
* Change filesystem quotas.
*/
#ifndef _SYS_SYSPROTO_H_
struct quotactl_args {
char *path;
int cmd;
int uid;
caddr_t arg;
};
#endif
/* ARGSUSED */
int
quotactl(td, uap)
struct thread *td;
register struct quotactl_args /* {
syscallarg(char *) path;
syscallarg(int) cmd;
syscallarg(int) uid;
syscallarg(caddr_t) arg;
} */ *uap;
{
struct mount *mp;
int error;
struct nameidata nd;
if (jailed(td->td_ucred) && !prison_quotas)
return (EPERM);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
vrele(nd.ni_vp);
if (error)
return (error);
error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
SCARG(uap, arg), td);
vn_finished_write(mp);
return (error);
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct statfs_args {
char *path;
struct statfs *buf;
};
#endif
/* ARGSUSED */
int
statfs(td, uap)
struct thread *td;
register struct statfs_args /* {
syscallarg(char *) path;
syscallarg(struct statfs *) buf;
} */ *uap;
{
register struct mount *mp;
register struct statfs *sp;
int error;
struct nameidata nd;
struct statfs sb;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if (suser(td)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
}
/*
* Get filesystem statistics.
*/
#ifndef _SYS_SYSPROTO_H_
struct fstatfs_args {
int fd;
struct statfs *buf;
};
#endif
/* ARGSUSED */
int
fstatfs(td, uap)
struct thread *td;
register struct fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct statfs *) buf;
} */ *uap;
{
struct file *fp;
struct mount *mp;
register struct statfs *sp;
int error;
struct statfs sb;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
fdrop(fp, td);
if (mp == NULL)
return (EBADF);
sp = &mp->mnt_stat;
error = VFS_STATFS(mp, sp, td);
if (error)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if (suser(td)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
}
/*
* Get statistics on all filesystems.
*/
#ifndef _SYS_SYSPROTO_H_
struct getfsstat_args {
struct statfs *buf;
long bufsize;
int flags;
};
#endif
int
getfsstat(td, uap)
struct thread *td;
register struct getfsstat_args /* {
syscallarg(struct statfs *) buf;
syscallarg(long) bufsize;
syscallarg(int) flags;
} */ *uap;
{
register struct mount *mp, *nmp;
register struct statfs *sp;
caddr_t sfsp;
long count, maxcount, error;
maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
sfsp = (caddr_t)SCARG(uap, buf);
count = 0;
mtx_lock(&mountlist_mtx);
for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) {
nmp = TAILQ_NEXT(mp, mnt_list);
continue;
}
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
* overrides MNT_WAIT.
*/
if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
(SCARG(uap, flags) & MNT_WAIT)) &&
(error = VFS_STATFS(mp, sp, td))) {
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = copyout((caddr_t)sp, sfsp, sizeof(*sp));
if (error) {
vfs_unbusy(mp, td);
return (error);
}
sfsp += sizeof(*sp);
}
count++;
mtx_lock(&mountlist_mtx);
nmp = TAILQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, td);
}
mtx_unlock(&mountlist_mtx);
if (sfsp && count > maxcount)
td->td_retval[0] = maxcount;
else
td->td_retval[0] = count;
return (0);
}
/*
* Change current working directory to a given file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchdir_args {
int fd;
};
#endif
/* ARGSUSED */
int
fchdir(td, uap)
struct thread *td;
struct fchdir_args /* {
syscallarg(int) fd;
} */ *uap;
{
register struct filedesc *fdp = td->td_proc->p_fd;
struct vnode *vp, *tdp, *vpold;
struct mount *mp;
struct file *fp;
int error;
if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
VREF(vp);
fdrop(fp, td);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
while (!error && (mp = vp->v_mountedhere) != NULL) {
if (vfs_busy(mp, 0, 0, td))
continue;
error = VFS_ROOT(mp, &tdp);
vfs_unbusy(mp, td);
if (error)
break;
vput(vp);
vp = tdp;
}
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0, td);
FILEDESC_LOCK(fdp);
vpold = fdp->fd_cdir;
fdp->fd_cdir = vp;
FILEDESC_UNLOCK(fdp);
vrele(vpold);
return (0);
}
/*
* Change current working directory (``.'').
*/
#ifndef _SYS_SYSPROTO_H_
struct chdir_args {
char *path;
};
#endif
/* ARGSUSED */
int
chdir(td, uap)
struct thread *td;
struct chdir_args /* {
syscallarg(char *) path;
} */ *uap;
{
register struct filedesc *fdp = td->td_proc->p_fd;
int error;
struct nameidata nd;
struct vnode *vp;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = change_dir(&nd, td)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
FILEDESC_LOCK(fdp);
vp = fdp->fd_cdir;
fdp->fd_cdir = nd.ni_vp;
FILEDESC_UNLOCK(fdp);
vrele(vp);
return (0);
}
/*
* Helper function for raised chroot(2) security function: Refuse if
* any filedescriptors are open directories.
*/
static int
chroot_refuse_vdir_fds(fdp)
struct filedesc *fdp;
{
struct vnode *vp;
struct file *fp;
int fd;
FILEDESC_LOCK(fdp);
for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
fp = fget_locked(fdp, fd);
if (fp == NULL)
continue;
if (fp->f_type == DTYPE_VNODE) {
vp = (struct vnode *)fp->f_data;
if (vp->v_type == VDIR) {
FILEDESC_UNLOCK(fdp);
return (EPERM);
}
}
}
FILEDESC_UNLOCK(fdp);
return (0);
}
/*
* This sysctl determines if we will allow a process to chroot(2) if it
* has a directory open:
* 0: disallowed for all processes.
* 1: allowed for processes that were not already chroot(2)'ed.
* 2: allowed for all processes.
*/
static int chroot_allow_open_directories = 1;
SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
&chroot_allow_open_directories, 0, "");
/*
* Change notion of root (``/'') directory.
*/
#ifndef _SYS_SYSPROTO_H_
struct chroot_args {
char *path;
};
#endif
/* ARGSUSED */
int
chroot(td, uap)
struct thread *td;
struct chroot_args /* {
syscallarg(char *) path;
} */ *uap;
{
register struct filedesc *fdp = td->td_proc->p_fd;
int error;
struct nameidata nd;
struct vnode *vp;
error = suser_cred(td->td_ucred, PRISON_ROOT);
if (error)
return (error);
FILEDESC_LOCK(fdp);
if (chroot_allow_open_directories == 0 ||
(chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
FILEDESC_UNLOCK(fdp);
error = chroot_refuse_vdir_fds(fdp);
} else
FILEDESC_UNLOCK(fdp);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = change_dir(&nd, td)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
FILEDESC_LOCK(fdp);
vp = fdp->fd_rdir;
fdp->fd_rdir = nd.ni_vp;
if (!fdp->fd_jdir) {
fdp->fd_jdir = nd.ni_vp;
VREF(fdp->fd_jdir);
}
FILEDESC_UNLOCK(fdp);
vrele(vp);
return (0);
}
/*
* Common routine for chroot and chdir.
*/
static int
change_dir(ndp, td)
register struct nameidata *ndp;
struct thread *td;
{
struct vnode *vp;
int error;
error = namei(ndp);
if (error)
return (error);
vp = ndp->ni_vp;
if (vp->v_type != VDIR)
error = ENOTDIR;
else
error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td);
if (error)
vput(vp);
else
VOP_UNLOCK(vp, 0, td);
return (error);
}
/*
* Check permissions, allocate an open file structure,
* and call the device open routine if any.
*/
#ifndef _SYS_SYSPROTO_H_
struct open_args {
char *path;
int flags;
int mode;
};
#endif
int
open(td, uap)
struct thread *td;
register struct open_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */ *uap;
{
struct proc *p = td->td_proc;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
struct vattr vat;
struct mount *mp;
int cmode, flags, oflags;
struct file *nfp;
int type, indx, error;
struct flock lf;
struct nameidata nd;
oflags = SCARG(uap, flags);
if ((oflags & O_ACCMODE) == O_ACCMODE)
return (EINVAL);
flags = FFLAGS(oflags);
error = falloc(td, &nfp, &indx);
if (error)
return (error);
fp = nfp;
FILEDESC_LOCK(fdp);
cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
FILEDESC_UNLOCK(fdp);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
td->td_dupfd = -indx - 1; /* XXX check for fdopen */
/*
* Bump the ref count to prevent another process from closing
* the descriptor while we are blocked in vn_open()
*/
fhold(fp);
error = vn_open(&nd, &flags, cmode);
if (error) {
/*
* release our own reference
*/
fdrop(fp, td);
/*
* handle special fdopen() case. bleh. dupfdopen() is
* responsible for dropping the old contents of ofiles[indx]
* if it succeeds.
*/
if ((error == ENODEV || error == ENXIO) &&
td->td_dupfd >= 0 && /* XXX from fdopen */
(error =
dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) {
td->td_retval[0] = indx;
return (0);
}
/*
* Clean up the descriptor, but only if another thread hadn't
* replaced or closed it.
*/
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else
FILEDESC_UNLOCK(fdp);
if (error == ERESTART)
error = EINTR;
return (error);
}
td->td_dupfd = 0;
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
/*
* There should be 2 references on the file, one from the descriptor
* table, and one for us.
*
* Handle the case where someone closed the file (via its file
* descriptor) while we were blocked. The end result should look
* like opening the file succeeded but it was immediately closed.
*/
FILEDESC_LOCK(fdp);
FILE_LOCK(fp);
if (fp->f_count == 1) {
KASSERT(fdp->fd_ofiles[indx] != fp,
("Open file descriptor lost all refs"));
FILEDESC_UNLOCK(fdp);
FILE_UNLOCK(fp);
VOP_UNLOCK(vp, 0, td);
vn_close(vp, flags & FMASK, fp->f_cred, td);
fdrop(fp, td);
td->td_retval[0] = indx;
return 0;
}
fp->f_data = (caddr_t)vp;
fp->f_flag = flags & FMASK;
fp->f_ops = &vnops;
fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE);
FILEDESC_UNLOCK(fdp);
FILE_UNLOCK(fp);
VOP_UNLOCK(vp, 0, td);
if (flags & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (flags & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((flags & FNONBLOCK) == 0)
type |= F_WAIT;
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0)
goto bad;
fp->f_flag |= FHASLOCK;
}
if (flags & O_TRUNC) {
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto bad;
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
VATTR_NULL(&vat);
vat.va_size = 0;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_SETATTR(vp, &vat, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
if (error)
goto bad;
}
/* assert that vn_open created a backing object if one is needed */
KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0,
("open: vmio vnode has no backing object after vn_open"));
/*
* Release our private reference, leaving the one associated with
* the descriptor table intact.
*/
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
bad:
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else
FILEDESC_UNLOCK(fdp);
return (error);
}
#ifdef COMPAT_43
/*
* Create a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct ocreat_args {
char *path;
int mode;
};
#endif
int
ocreat(td, uap)
struct thread *td;
register struct ocreat_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap;
{
struct open_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */ nuap;
SCARG(&nuap, path) = SCARG(uap, path);
SCARG(&nuap, mode) = SCARG(uap, mode);
SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
return (open(td, &nuap));
}
#endif /* COMPAT_43 */
/*
* Create a special file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mknod_args {
char *path;
int mode;
int dev;
};
#endif
/* ARGSUSED */
int
mknod(td, uap)
struct thread *td;
register struct mknod_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
syscallarg(int) dev;
} */ *uap;
{
struct vnode *vp;
struct mount *mp;
struct vattr vattr;
int error;
int whiteout = 0;
struct nameidata nd;
switch (SCARG(uap, mode) & S_IFMT) {
case S_IFCHR:
case S_IFBLK:
error = suser(td);
break;
default:
error = suser_cred(td->td_ucred, PRISON_ROOT);
break;
}
if (error)
return (error);
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
vrele(vp);
error = EEXIST;
} else {
VATTR_NULL(&vattr);
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
vattr.va_rdev = SCARG(uap, dev);
whiteout = 0;
switch (SCARG(uap, mode) & S_IFMT) {
case S_IFMT: /* used by badsect to flag bad sectors */
vattr.va_type = VBAD;
break;
case S_IFCHR:
vattr.va_type = VCHR;
break;
case S_IFBLK:
vattr.va_type = VBLK;
break;
case S_IFWHT:
whiteout = 1;
break;
default:
error = EINVAL;
break;
}
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
if (!error) {
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
if (whiteout)
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
else {
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
&nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
}
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mknod");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "mknod");
return (error);
}
/*
* Create a named pipe.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkfifo_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
mkfifo(td, uap)
struct thread *td;
register struct mkfifo_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap;
{
struct mount *mp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
if (nd.ni_vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VFIFO;
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
return (error);
}
/*
* Make a hard file link.
*/
#ifndef _SYS_SYSPROTO_H_
struct link_args {
char *path;
char *link;
};
#endif
/* ARGSUSED */
int
link(td, uap)
struct thread *td;
register struct link_args /* {
syscallarg(char *) path;
syscallarg(char *) link;
} */ *uap;
{
struct vnode *vp;
struct mount *mp;
struct nameidata nd;
int error;
bwillwrite();
NDINIT(&nd, LOOKUP, FOLLOW|NOOBJ, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (vp->v_type == VDIR) {
vrele(vp);
return (EPERM); /* POSIX */
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
NDINIT(&nd, CREATE, LOCKPARENT|NOOBJ, UIO_USERSPACE, SCARG(uap, link), td);
if ((error = namei(&nd)) == 0) {
if (nd.ni_vp != NULL) {
vrele(nd.ni_vp);
error = EEXIST;
} else {
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
}
vrele(vp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "link");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "link");
return (error);
}
/*
* Make a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct symlink_args {
char *path;
char *link;
};
#endif
/* ARGSUSED */
int
symlink(td, uap)
struct thread *td;
register struct symlink_args /* {
syscallarg(char *) path;
syscallarg(char *) link;
} */ *uap;
{
struct mount *mp;
struct vattr vattr;
char *path;
int error;
struct nameidata nd;
path = uma_zalloc(namei_zone, M_WAITOK);
if ((error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL)) != 0)
goto out;
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT|NOOBJ, UIO_USERSPACE, SCARG(uap, link), td);
if ((error = namei(&nd)) != 0)
goto out;
if (nd.ni_vp) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(nd.ni_vp);
vput(nd.ni_dvp);
error = EEXIST;
goto out;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
NDFREE(&nd, NDF_ONLY_PNBUF);
if (error == 0)
vput(nd.ni_vp);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "symlink");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "symlink");
out:
uma_zfree(namei_zone, path);
return (error);
}
/*
* Delete a whiteout from the filesystem.
*/
/* ARGSUSED */
int
undelete(td, uap)
struct thread *td;
register struct undelete_args /* {
syscallarg(char *) path;
} */ *uap;
{
int error;
struct mount *mp;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
SCARG(uap, path), td);
error = namei(&nd);
if (error)
return (error);
if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp)
vrele(nd.ni_vp);
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete");
return (error);
}
/*
* Delete a name from the filesystem.
*/
#ifndef _SYS_SYSPROTO_H_
struct unlink_args {
char *path;
};
#endif
/* ARGSUSED */
int
unlink(td, uap)
struct thread *td;
struct unlink_args /* {
syscallarg(char *) path;
} */ *uap;
{
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type == VDIR)
error = EPERM; /* POSIX */
else {
/*
* The root of a mounted filesystem cannot be deleted.
*
* XXX: can this only be a VDIR case?
*/
if (vp->v_flag & VROOT)
error = EBUSY;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(vp);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (!error) {
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
vput(vp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "unlink");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "unlink");
return (error);
}
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct lseek_args {
int fd;
int pad;
off_t offset;
int whence;
};
#endif
int
lseek(td, uap)
struct thread *td;
register struct lseek_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ *uap;
{
struct ucred *cred = td->td_ucred;
struct file *fp;
struct vnode *vp;
struct vattr vattr;
off_t offset;
int error, noneg;
if ((error = fget(td, uap->fd, &fp)) != 0)
return (error);
if (fp->f_type != DTYPE_VNODE) {
fdrop(fp, td);
return (ESPIPE);
}
vp = (struct vnode *)fp->f_data;
noneg = (vp->v_type != VCHR);
offset = SCARG(uap, offset);
switch (SCARG(uap, whence)) {
case L_INCR:
if (noneg &&
(fp->f_offset < 0 ||
(offset > 0 && fp->f_offset > OFF_MAX - offset)))
return (EOVERFLOW);
offset += fp->f_offset;
break;
case L_XTND:
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_GETATTR(vp, &vattr, cred, td);
VOP_UNLOCK(vp, 0, td);
if (error)
return (error);
if (noneg &&
(vattr.va_size > OFF_MAX ||
(offset > 0 && vattr.va_size > OFF_MAX - offset)))
return (EOVERFLOW);
offset += vattr.va_size;
break;
case L_SET:
break;
default:
fdrop(fp, td);
return (EINVAL);
}
if (noneg && offset < 0)
return (EINVAL);
fp->f_offset = offset;
*(off_t *)(td->td_retval) = fp->f_offset;
fdrop(fp, td);
return (0);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Reposition read/write file offset.
*/
#ifndef _SYS_SYSPROTO_H_
struct olseek_args {
int fd;
long offset;
int whence;
};
#endif
int
olseek(td, uap)
struct thread *td;
register struct olseek_args /* {
syscallarg(int) fd;
syscallarg(long) offset;
syscallarg(int) whence;
} */ *uap;
{
struct lseek_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ nuap;
int error;
SCARG(&nuap, fd) = SCARG(uap, fd);
SCARG(&nuap, offset) = SCARG(uap, offset);
SCARG(&nuap, whence) = SCARG(uap, whence);
error = lseek(td, &nuap);
return (error);
}
#endif /* COMPAT_43 */
/*
* Check access permissions using passed credentials.
*/
static int
vn_access(vp, user_flags, cred, td)
struct vnode *vp;
int user_flags;
struct ucred *cred;
struct thread *td;
{
int error, flags;
/* Flags == 0 means only check for existence. */
error = 0;
if (user_flags) {
flags = 0;
if (user_flags & R_OK)
flags |= VREAD;
if (user_flags & W_OK)
flags |= VWRITE;
if (user_flags & X_OK)
flags |= VEXEC;
if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
error = VOP_ACCESS(vp, flags, cred, td);
}
return (error);
}
/*
* Check access permissions using "real" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct access_args {
char *path;
int flags;
};
#endif
int
access(td, uap)
struct thread *td;
register struct access_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap;
{
struct ucred *cred, *tmpcred;
register struct vnode *vp;
int error;
struct nameidata nd;
/*
* Create and modify a temporary credential instead of one that
* is potentially shared. This could also mess up socket
* buffer accounting which can run in an interrupt context.
*
* XXX - Depending on how "threads" are finally implemented, it
* may be better to explicitly pass the credential to namei()
* rather than to modify the potentially shared process structure.
*/
cred = td->td_ucred;
tmpcred = crdup(cred);
tmpcred->cr_uid = cred->cr_ruid;
tmpcred->cr_groups[0] = cred->cr_rgid;
td->td_ucred = tmpcred;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
goto out1;
vp = nd.ni_vp;
error = vn_access(vp, SCARG(uap, flags), tmpcred, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
out1:
td->td_ucred = cred;
crfree(tmpcred);
return (error);
}
/*
* Check access permissions using "effective" credentials.
*/
#ifndef _SYS_SYSPROTO_H_
struct eaccess_args {
char *path;
int flags;
};
#endif
int
eaccess(td, uap)
struct thread *td;
register struct eaccess_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap;
{
struct nameidata nd;
struct vnode *vp;
int error;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_access(vp, SCARG(uap, flags), td->td_ucred, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Get file status; this version follows links.
*/
#ifndef _SYS_SYSPROTO_H_
struct ostat_args {
char *path;
struct ostat *ub;
};
#endif
/* ARGSUSED */
int
ostat(td, uap)
struct thread *td;
register struct ostat_args /* {
syscallarg(char *) path;
syscallarg(struct ostat *) ub;
} */ *uap;
{
struct stat sb;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(nd.ni_vp, &sb, td);
vput(nd.ni_vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct olstat_args {
char *path;
struct ostat *ub;
};
#endif
/* ARGSUSED */
int
olstat(td, uap)
struct thread *td;
register struct olstat_args /* {
syscallarg(char *) path;
syscallarg(struct ostat *) ub;
} */ *uap;
{
struct vnode *vp;
struct stat sb;
struct ostat osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_stat(vp, &sb, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Convert from an old to a new stat structure.
*/
void
cvtstat(st, ost)
struct stat *st;
struct ostat *ost;
{
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode;
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
if (st->st_size < (quad_t)1 << 32)
ost->st_size = st->st_size;
else
ost->st_size = -2;
ost->st_atime = st->st_atime;
ost->st_mtime = st->st_mtime;
ost->st_ctime = st->st_ctime;
ost->st_blksize = st->st_blksize;
ost->st_blocks = st->st_blocks;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Get file status; this version follows links.
*/
#ifndef _SYS_SYSPROTO_H_
struct stat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
stat(td, uap)
struct thread *td;
register struct stat_args /* {
syscallarg(char *) path;
syscallarg(struct stat *) ub;
} */ *uap;
{
struct stat sb;
int error;
struct nameidata nd;
#ifndef LOOKUP_EXCLUSIVE
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | NOOBJ,
UIO_USERSPACE, SCARG(uap, path), td);
#else
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
#endif
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_vp);
if (error)
return (error);
error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct lstat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
lstat(td, uap)
struct thread *td;
register struct lstat_args /* {
syscallarg(char *) path;
syscallarg(struct stat *) ub;
} */ *uap;
{
int error;
struct vnode *vp;
struct stat sb;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
error = vn_stat(vp, &sb, td);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(vp);
if (error)
return (error);
error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
return (error);
}
/*
* Implementation of the NetBSD stat() function.
* XXX This should probably be collapsed with the FreeBSD version,
* as the differences are only due to vn_stat() clearing spares at
* the end of the structures. vn_stat could be split to avoid this,
* and thus collapse the following to close to zero code.
*/
void
cvtnstat(sb, nsb)
struct stat *sb;
struct nstat *nsb;
{
nsb->st_dev = sb->st_dev;
nsb->st_ino = sb->st_ino;
nsb->st_mode = sb->st_mode;
nsb->st_nlink = sb->st_nlink;
nsb->st_uid = sb->st_uid;
nsb->st_gid = sb->st_gid;
nsb->st_rdev = sb->st_rdev;
nsb->st_atimespec = sb->st_atimespec;
nsb->st_mtimespec = sb->st_mtimespec;
nsb->st_ctimespec = sb->st_ctimespec;
nsb->st_size = sb->st_size;
nsb->st_blocks = sb->st_blocks;
nsb->st_blksize = sb->st_blksize;
nsb->st_flags = sb->st_flags;
nsb->st_gen = sb->st_gen;
nsb->st_qspare[0] = sb->st_qspare[0];
nsb->st_qspare[1] = sb->st_qspare[1];
}
#ifndef _SYS_SYSPROTO_H_
struct nstat_args {
char *path;
struct nstat *ub;
};
#endif
/* ARGSUSED */
int
nstat(td, uap)
struct thread *td;
register struct nstat_args /* {
syscallarg(char *) path;
syscallarg(struct nstat *) ub;
} */ *uap;
{
struct stat sb;
struct nstat nsb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(nd.ni_vp, &sb, td);
vput(nd.ni_vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb));
return (error);
}
/*
* NetBSD lstat. Get file status; this version does not follow links.
*/
#ifndef _SYS_SYSPROTO_H_
struct lstat_args {
char *path;
struct stat *ub;
};
#endif
/* ARGSUSED */
int
nlstat(td, uap)
struct thread *td;
register struct nlstat_args /* {
syscallarg(char *) path;
syscallarg(struct nstat *) ub;
} */ *uap;
{
int error;
struct vnode *vp;
struct stat sb;
struct nstat nsb;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
error = vn_stat(vp, &sb, td);
vput(vp);
if (error)
return (error);
cvtnstat(&sb, &nsb);
error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb));
return (error);
}
/*
* Get configurable pathname variables.
*/
#ifndef _SYS_SYSPROTO_H_
struct pathconf_args {
char *path;
int name;
};
#endif
/* ARGSUSED */
int
pathconf(td, uap)
struct thread *td;
register struct pathconf_args /* {
syscallarg(char *) path;
syscallarg(int) name;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), td->td_retval);
vput(nd.ni_vp);
return (error);
}
/*
* Return target name of a symbolic link.
*/
#ifndef _SYS_SYSPROTO_H_
struct readlink_args {
char *path;
char *buf;
int count;
};
#endif
/* ARGSUSED */
int
readlink(td, uap)
struct thread *td;
register struct readlink_args /* {
syscallarg(char *) path;
syscallarg(char *) buf;
syscallarg(int) count;
} */ *uap;
{
register struct vnode *vp;
struct iovec aiov;
struct uio auio;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
if (vp->v_type != VLNK)
error = EINVAL;
else {
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = SCARG(uap, count);
error = VOP_READLINK(vp, &auio, td->td_ucred);
}
vput(vp);
td->td_retval[0] = SCARG(uap, count) - auio.uio_resid;
return (error);
}
/*
* Common implementation code for chflags() and fchflags().
*/
static int
setfflags(td, vp, flags)
struct thread *td;
struct vnode *vp;
int flags;
{
int error;
struct mount *mp;
struct vattr vattr;
/*
* Prevent non-root users from setting flags on devices. When
* a device is reused, users can retain ownership of the device
* if they are allowed to set flags and programs assume that
* chown can't fail when done as root.
*/
if (vp->v_type == VCHR || vp->v_type == VBLK) {
error = suser_cred(td->td_ucred, PRISON_ROOT);
if (error)
return (error);
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_flags = flags;
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Change flags of a file given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chflags_args {
char *path;
int flags;
};
#endif
/* ARGSUSED */
int
chflags(td, uap)
struct thread *td;
register struct chflags_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfflags(td, nd.ni_vp, SCARG(uap, flags));
vrele(nd.ni_vp);
return error;
}
/*
* Change flags of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchflags_args {
int fd;
int flags;
};
#endif
/* ARGSUSED */
int
fchflags(td, uap)
struct thread *td;
register struct fchflags_args /* {
syscallarg(int) fd;
syscallarg(int) flags;
} */ *uap;
{
struct file *fp;
int error;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = setfflags(td, (struct vnode *) fp->f_data, SCARG(uap, flags));
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for chmod(), lchmod() and fchmod().
*/
static int
setfmode(td, vp, mode)
struct thread *td;
struct vnode *vp;
int mode;
{
int error;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_mode = mode & ALLPERMS;
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return error;
}
/*
* Change mode of a file given path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chmod_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
chmod(td, uap)
struct thread *td;
register struct chmod_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(td, nd.ni_vp, SCARG(uap, mode));
vrele(nd.ni_vp);
return error;
}
/*
* Change mode of a file given path name (don't follow links.)
*/
#ifndef _SYS_SYSPROTO_H_
struct lchmod_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
lchmod(td, uap)
struct thread *td;
register struct lchmod_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfmode(td, nd.ni_vp, SCARG(uap, mode));
vrele(nd.ni_vp);
return error;
}
/*
* Change mode of a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchmod_args {
int fd;
int mode;
};
#endif
/* ARGSUSED */
int
fchmod(td, uap)
struct thread *td;
register struct fchmod_args /* {
syscallarg(int) fd;
syscallarg(int) mode;
} */ *uap;
{
struct file *fp;
struct vnode *vp;
int error;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
error = setfmode(td, (struct vnode *)fp->f_data, SCARG(uap, mode));
fdrop(fp, td);
return (error);
}
/*
* Common implementation for chown(), lchown(), and fchown()
*/
static int
setfown(td, vp, uid, gid)
struct thread *td;
struct vnode *vp;
uid_t uid;
gid_t gid;
{
int error;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_uid = uid;
vattr.va_gid = gid;
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return error;
}
/*
* Set ownership given a path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct chown_args {
char *path;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
chown(td, uap)
struct thread *td;
register struct chown_args /* {
syscallarg(char *) path;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfown(td, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid));
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a path name, do not cross symlinks.
*/
#ifndef _SYS_SYSPROTO_H_
struct lchown_args {
char *path;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
lchown(td, uap)
struct thread *td;
register struct lchown_args /* {
syscallarg(char *) path;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap;
{
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setfown(td, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid));
vrele(nd.ni_vp);
return (error);
}
/*
* Set ownership given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct fchown_args {
int fd;
int uid;
int gid;
};
#endif
/* ARGSUSED */
int
fchown(td, uap)
struct thread *td;
register struct fchown_args /* {
syscallarg(int) fd;
syscallarg(int) uid;
syscallarg(int) gid;
} */ *uap;
{
struct file *fp;
struct vnode *vp;
int error;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
error = setfown(td, (struct vnode *)fp->f_data,
SCARG(uap, uid), SCARG(uap, gid));
fdrop(fp, td);
return (error);
}
/*
* Common implementation code for utimes(), lutimes(), and futimes().
*/
static int
getutimes(usrtvp, tsp)
const struct timeval *usrtvp;
struct timespec *tsp;
{
struct timeval tv[2];
int error;
if (usrtvp == NULL) {
microtime(&tv[0]);
TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
tsp[1] = tsp[0];
} else {
if ((error = copyin(usrtvp, tv, sizeof (tv))) != 0)
return (error);
TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
TIMEVAL_TO_TIMESPEC(&tv[1], &tsp[1]);
}
return 0;
}
/*
* Common implementation code for utimes(), lutimes(), and futimes().
*/
static int
setutimes(td, vp, ts, nullflag)
struct thread *td;
struct vnode *vp;
const struct timespec *ts;
int nullflag;
{
int error;
struct mount *mp;
struct vattr vattr;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
VATTR_NULL(&vattr);
vattr.va_atime = ts[0];
vattr.va_mtime = ts[1];
if (nullflag)
vattr.va_vaflags |= VA_UTIMES_NULL;
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return error;
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct utimes_args {
char *path;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
utimes(td, uap)
struct thread *td;
register struct utimes_args /* {
syscallarg(char *) path;
syscallarg(struct timeval *) tptr;
} */ *uap;
{
struct timespec ts[2];
struct timeval *usrtvp;
int error;
struct nameidata nd;
usrtvp = SCARG(uap, tptr);
if ((error = getutimes(usrtvp, ts)) != 0)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, usrtvp == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct lutimes_args {
char *path;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
lutimes(td, uap)
struct thread *td;
register struct lutimes_args /* {
syscallarg(char *) path;
syscallarg(struct timeval *) tptr;
} */ *uap;
{
struct timespec ts[2];
struct timeval *usrtvp;
int error;
struct nameidata nd;
usrtvp = SCARG(uap, tptr);
if ((error = getutimes(usrtvp, ts)) != 0)
return (error);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = setutimes(td, nd.ni_vp, ts, usrtvp == NULL);
vrele(nd.ni_vp);
return (error);
}
/*
* Set the access and modification times of a file.
*/
#ifndef _SYS_SYSPROTO_H_
struct futimes_args {
int fd;
struct timeval *tptr;
};
#endif
/* ARGSUSED */
int
futimes(td, uap)
struct thread *td;
register struct futimes_args /* {
syscallarg(int ) fd;
syscallarg(struct timeval *) tptr;
} */ *uap;
{
struct timespec ts[2];
struct file *fp;
struct timeval *usrtvp;
int error;
usrtvp = SCARG(uap, tptr);
if ((error = getutimes(usrtvp, ts)) != 0)
return (error);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = setutimes(td, (struct vnode *)fp->f_data, ts, usrtvp == NULL);
fdrop(fp, td);
return (error);
}
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct truncate_args {
char *path;
int pad;
off_t length;
};
#endif
/* ARGSUSED */
int
truncate(td, uap)
struct thread *td;
register struct truncate_args /* {
syscallarg(char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap;
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
if (uap->length < 0)
return(EINVAL);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0 &&
(error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = SCARG(uap, length);
error = VOP_SETATTR(vp, &vattr, td->td_ucred, td);
}
vput(vp);
vn_finished_write(mp);
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct ftruncate_args {
int fd;
int pad;
off_t length;
};
#endif
/* ARGSUSED */
int
ftruncate(td, uap)
struct thread *td;
register struct ftruncate_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ *uap;
{
struct mount *mp;
struct vattr vattr;
struct vnode *vp;
struct file *fp;
int error;
if (uap->length < 0)
return(EINVAL);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FWRITE) == 0) {
fdrop(fp, td);
return (EINVAL);
}
vp = (struct vnode *)fp->f_data;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
fdrop(fp, td);
return (error);
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_type == VDIR)
error = EISDIR;
else if ((error = vn_writechk(vp)) == 0) {
VATTR_NULL(&vattr);
vattr.va_size = SCARG(uap, length);
error = VOP_SETATTR(vp, &vattr, fp->f_cred, td);
}
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
fdrop(fp, td);
return (error);
}
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
/*
* Truncate a file given its path name.
*/
#ifndef _SYS_SYSPROTO_H_
struct otruncate_args {
char *path;
long length;
};
#endif
/* ARGSUSED */
int
otruncate(td, uap)
struct thread *td;
register struct otruncate_args /* {
syscallarg(char *) path;
syscallarg(long) length;
} */ *uap;
{
struct truncate_args /* {
syscallarg(char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ nuap;
SCARG(&nuap, path) = SCARG(uap, path);
SCARG(&nuap, length) = SCARG(uap, length);
return (truncate(td, &nuap));
}
/*
* Truncate a file given a file descriptor.
*/
#ifndef _SYS_SYSPROTO_H_
struct oftruncate_args {
int fd;
long length;
};
#endif
/* ARGSUSED */
int
oftruncate(td, uap)
struct thread *td;
register struct oftruncate_args /* {
syscallarg(int) fd;
syscallarg(long) length;
} */ *uap;
{
struct ftruncate_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ nuap;
SCARG(&nuap, fd) = SCARG(uap, fd);
SCARG(&nuap, length) = SCARG(uap, length);
return (ftruncate(td, &nuap));
}
#endif /* COMPAT_43 || COMPAT_SUNOS */
/*
* Sync an open file.
*/
#ifndef _SYS_SYSPROTO_H_
struct fsync_args {
int fd;
};
#endif
/* ARGSUSED */
int
fsync(td, uap)
struct thread *td;
struct fsync_args /* {
syscallarg(int) fd;
} */ *uap;
{
struct vnode *vp;
struct mount *mp;
struct file *fp;
vm_object_t obj;
int error;
GIANT_REQUIRED;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
fdrop(fp, td);
return (error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (VOP_GETVOBJECT(vp, &obj) == 0) {
vm_object_page_clean(obj, 0, 0, 0);
}
error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, td);
#ifdef SOFTUPDATES
if (error == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
error = softdep_fsync(vp);
#endif
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
fdrop(fp, td);
return (error);
}
/*
* Rename files. Source and destination must either both be directories,
* or both not be directories. If target is a directory, it must be empty.
*/
#ifndef _SYS_SYSPROTO_H_
struct rename_args {
char *from;
char *to;
};
#endif
/* ARGSUSED */
int
rename(td, uap)
struct thread *td;
register struct rename_args /* {
syscallarg(char *) from;
syscallarg(char *) to;
} */ *uap;
{
struct mount *mp;
struct vnode *tvp, *fvp, *tdvp;
struct nameidata fromnd, tond;
int error;
bwillwrite();
NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
SCARG(uap, from), td);
if ((error = namei(&fromnd)) != 0)
return (error);
fvp = fromnd.ni_vp;
if ((error = vn_start_write(fvp, &mp, V_WAIT | PCATCH)) != 0) {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | NOOBJ,
UIO_USERSPACE, SCARG(uap, to), td);
if (fromnd.ni_vp->v_type == VDIR)
tond.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&tond)) != 0) {
/* Translate error code for rename("dir1", "dir2/."). */
if (error == EISDIR && fvp->v_type == VDIR)
error = EINVAL;
NDFREE(&fromnd, NDF_ONLY_PNBUF);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = ENOTDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = EISDIR;
goto out;
}
}
if (fvp == tdvp)
error = EINVAL;
/*
* If source is the same as the destination (that is the
* same inode number with the same name in the same directory),
* then there is nothing to do.
*/
if (fvp == tvp && fromnd.ni_dvp == tdvp &&
fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
!bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
fromnd.ni_cnd.cn_namelen))
error = -1;
out:
if (!error) {
VOP_LEASE(tdvp, td, td->td_ucred, LEASE_WRITE);
if (fromnd.ni_dvp != tdvp) {
VOP_LEASE(fromnd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
}
if (tvp) {
VOP_LEASE(tvp, td, td->td_ucred, LEASE_WRITE);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
} else {
NDFREE(&fromnd, NDF_ONLY_PNBUF);
NDFREE(&tond, NDF_ONLY_PNBUF);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(fromnd.ni_dvp, "rename");
ASSERT_VOP_UNLOCKED(fromnd.ni_vp, "rename");
ASSERT_VOP_UNLOCKED(tond.ni_dvp, "rename");
ASSERT_VOP_UNLOCKED(tond.ni_vp, "rename");
out1:
if (fromnd.ni_startdir)
vrele(fromnd.ni_startdir);
if (error == -1)
return (0);
return (error);
}
/*
* Make a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct mkdir_args {
char *path;
int mode;
};
#endif
/* ARGSUSED */
int
mkdir(td, uap)
struct thread *td;
register struct mkdir_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap;
{
return vn_mkdir(uap->path, uap->mode, UIO_USERSPACE, td);
}
int
vn_mkdir(path, mode, segflg, td)
char *path;
int mode;
enum uio_seg segflg;
struct thread *td;
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, CREATE, LOCKPARENT, segflg, path, td);
nd.ni_cnd.cn_flags |= WILLBEDIR;
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp != NULL) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vrele(vp);
vput(nd.ni_dvp);
return (EEXIST);
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VATTR_NULL(&vattr);
vattr.va_type = VDIR;
FILEDESC_LOCK(td->td_proc->p_fd);
vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask;
FILEDESC_UNLOCK(td->td_proc->p_fd);
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
NDFREE(&nd, NDF_ONLY_PNBUF);
vput(nd.ni_dvp);
if (!error)
vput(nd.ni_vp);
vn_finished_write(mp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mkdir");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "mkdir");
return (error);
}
/*
* Remove a directory file.
*/
#ifndef _SYS_SYSPROTO_H_
struct rmdir_args {
char *path;
};
#endif
/* ARGSUSED */
int
rmdir(td, uap)
struct thread *td;
struct rmdir_args /* {
syscallarg(char *) path;
} */ *uap;
{
struct mount *mp;
struct vnode *vp;
int error;
struct nameidata nd;
restart:
bwillwrite();
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT) {
error = EBUSY;
goto out;
}
if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
return (error);
goto restart;
}
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
vn_finished_write(mp);
out:
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
ASSERT_VOP_UNLOCKED(nd.ni_dvp, "rmdir");
ASSERT_VOP_UNLOCKED(nd.ni_vp, "rmdir");
return (error);
}
#ifdef COMPAT_43
/*
* Read a block of directory entries in a file system independent format.
*/
#ifndef _SYS_SYSPROTO_H_
struct ogetdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
ogetdirentries(td, uap)
struct thread *td;
register struct ogetdirentries_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(u_int) count;
syscallarg(long *) basep;
} */ *uap;
{
struct vnode *vp;
struct file *fp;
struct uio auio, kuio;
struct iovec aiov, kiov;
struct dirent *dp, *edp;
caddr_t dirbuf;
int error, eofflag, readcnt;
long loff;
/* XXX arbitrary sanity limit on `count'. */
if (SCARG(uap, count) > 64 * 1024)
return (EINVAL);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = (struct vnode *)fp->f_data;
unionread:
if (vp->v_type != VDIR) {
fdrop(fp, td);
return (EINVAL);
}
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = SCARG(uap, count);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
loff = auio.uio_offset = fp->f_offset;
# if (BYTE_ORDER != LITTLE_ENDIAN)
if (vp->v_mount->mnt_maxsymlinklen <= 0) {
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
NULL, NULL);
fp->f_offset = auio.uio_offset;
} else
# endif
{
kuio = auio;
kuio.uio_iov = &kiov;
kuio.uio_segflg = UIO_SYSSPACE;
kiov.iov_len = SCARG(uap, count);
MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK);
kiov.iov_base = dirbuf;
error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
NULL, NULL);
fp->f_offset = kuio.uio_offset;
if (error == 0) {
readcnt = SCARG(uap, count) - kuio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* The expected low byte of
* dp->d_namlen is our dp->d_type.
* The high MBZ byte of dp->d_namlen
* is our dp->d_namlen.
*/
dp->d_type = dp->d_namlen;
dp->d_namlen = 0;
# else
/*
* The dp->d_type is the high byte
* of the expected dp->d_namlen,
* so must be zero'ed.
*/
dp->d_type = 0;
# endif
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, &auio);
}
FREE(dirbuf, M_TEMP);
}
VOP_UNLOCK(vp, 0, td);
if (error) {
fdrop(fp, td);
return (error);
}
if (SCARG(uap, count) == auio.uio_resid) {
if (union_dircheckp) {
error = union_dircheckp(td, &vp, fp);
if (error == -1)
goto unionread;
if (error) {
fdrop(fp, td);
return (error);
}
}
if ((vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
}
error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
sizeof(long));
fdrop(fp, td);
td->td_retval[0] = SCARG(uap, count) - auio.uio_resid;
return (error);
}
#endif /* COMPAT_43 */
/*
* Read a block of directory entries in a file system independent format.
*/
#ifndef _SYS_SYSPROTO_H_
struct getdirentries_args {
int fd;
char *buf;
u_int count;
long *basep;
};
#endif
int
getdirentries(td, uap)
struct thread *td;
register struct getdirentries_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(u_int) count;
syscallarg(long *) basep;
} */ *uap;
{
struct vnode *vp;
struct file *fp;
struct uio auio;
struct iovec aiov;
long loff;
int error, eofflag;
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = (struct vnode *)fp->f_data;
unionread:
if (vp->v_type != VDIR) {
fdrop(fp, td);
return (EINVAL);
}
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
auio.uio_resid = SCARG(uap, count);
/* vn_lock(vp, LK_SHARED | LK_RETRY, td); */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
loff = auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL);
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp, 0, td);
if (error) {
fdrop(fp, td);
return (error);
}
if (SCARG(uap, count) == auio.uio_resid) {
if (union_dircheckp) {
error = union_dircheckp(td, &vp, fp);
if (error == -1)
goto unionread;
if (error) {
fdrop(fp, td);
return (error);
}
}
if ((vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
}
if (SCARG(uap, basep) != NULL) {
error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
sizeof(long));
}
td->td_retval[0] = SCARG(uap, count) - auio.uio_resid;
fdrop(fp, td);
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct getdents_args {
int fd;
char *buf;
size_t count;
};
#endif
int
getdents(td, uap)
struct thread *td;
register struct getdents_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(u_int) count;
} */ *uap;
{
struct getdirentries_args ap;
ap.fd = uap->fd;
ap.buf = uap->buf;
ap.count = uap->count;
ap.basep = NULL;
return getdirentries(td, &ap);
}
/*
* Set the mode mask for creation of filesystem nodes.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct umask_args {
int newmask;
};
#endif
int
umask(td, uap)
struct thread *td;
struct umask_args /* {
syscallarg(int) newmask;
} */ *uap;
{
register struct filedesc *fdp;
FILEDESC_LOCK(td->td_proc->p_fd);
fdp = td->td_proc->p_fd;
td->td_retval[0] = fdp->fd_cmask;
fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS;
FILEDESC_UNLOCK(td->td_proc->p_fd);
return (0);
}
/*
* Void all references to file by ripping underlying filesystem
* away from vnode.
*/
#ifndef _SYS_SYSPROTO_H_
struct revoke_args {
char *path;
};
#endif
/* ARGSUSED */
int
revoke(td, uap)
struct thread *td;
register struct revoke_args /* {
syscallarg(char *) path;
} */ *uap;
{
struct mount *mp;
struct vnode *vp;
struct vattr vattr;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path),
td);
if ((error = namei(&nd)) != 0)
return (error);
vp = nd.ni_vp;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (vp->v_type != VCHR) {
vput(vp);
return (EINVAL);
}
error = VOP_GETATTR(vp, &vattr, td->td_ucred, td);
if (error) {
vput(vp);
return (error);
}
VOP_UNLOCK(vp, 0, td);
if (td->td_ucred->cr_uid != vattr.va_uid) {
error = suser_cred(td->td_ucred, PRISON_ROOT);
if (error)
goto out;
}
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto out;
if (vcount(vp) > 1)
VOP_REVOKE(vp, REVOKEALL);
vn_finished_write(mp);
out:
vrele(vp);
return (error);
}
/*
* Convert a user file descriptor to a kernel file entry.
* The file entry is locked upon returning.
*/
int
getvnode(fdp, fd, fpp)
struct filedesc *fdp;
int fd;
struct file **fpp;
{
int error;
struct file *fp;
fp = NULL;
if (fdp == NULL)
error = EBADF;
else {
FILEDESC_LOCK(fdp);
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL)
error = EBADF;
else if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) {
fp = NULL;
error = EINVAL;
} else {
fhold(fp);
error = 0;
}
FILEDESC_UNLOCK(fdp);
}
*fpp = fp;
return (error);
}
/*
* Get (NFS) file handle
*/
#ifndef _SYS_SYSPROTO_H_
struct getfh_args {
char *fname;
fhandle_t *fhp;
};
#endif
int
getfh(td, uap)
struct thread *td;
register struct getfh_args *uap;
{
struct nameidata nd;
fhandle_t fh;
register struct vnode *vp;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->fname, td);
error = namei(&nd);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
bzero(&fh, sizeof(fh));
fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VFS_VPTOFH(vp, &fh.fh_fid);
vput(vp);
if (error)
return (error);
error = copyout(&fh, uap->fhp, sizeof (fh));
return (error);
}
/*
* syscall for the rpc.lockd to use to translate a NFS file handle into
* an open descriptor.
*
* warning: do not remove the suser() call or this becomes one giant
* security hole.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhopen_args {
const struct fhandle *u_fhp;
int flags;
};
#endif
int
fhopen(td, uap)
struct thread *td;
struct fhopen_args /* {
syscallarg(const struct fhandle *) u_fhp;
syscallarg(int) flags;
} */ *uap;
{
struct proc *p = td->td_proc;
struct mount *mp;
struct vnode *vp;
struct fhandle fhp;
struct vattr vat;
struct vattr *vap = &vat;
struct flock lf;
struct file *fp;
register struct filedesc *fdp = p->p_fd;
int fmode, mode, error, type;
struct file *nfp;
int indx;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
fmode = FFLAGS(SCARG(uap, flags));
/* why not allow a non-read/write open for our lockd? */
if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
return (EINVAL);
error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp));
if (error)
return(error);
/* find the mount point */
mp = vfs_getvfs(&fhp.fh_fsid);
if (mp == NULL)
return (ESTALE);
/* now give me my vnode, it gets returned to me locked */
error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
if (error)
return (error);
/*
* from now on we have to make sure not
* to forget about the vnode
* any error that causes an abort must vput(vp)
* just set error = err and 'goto bad;'.
*/
/*
* from vn_open
*/
if (vp->v_type == VLNK) {
error = EMLINK;
goto bad;
}
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
mode = 0;
if (fmode & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
error = vn_writechk(vp);
if (error)
goto bad;
mode |= VWRITE;
}
if (fmode & FREAD)
mode |= VREAD;
if (mode) {
error = VOP_ACCESS(vp, mode, td->td_ucred, td);
if (error)
goto bad;
}
if (fmode & O_TRUNC) {
VOP_UNLOCK(vp, 0, td); /* XXX */
if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
VATTR_NULL(vap);
vap->va_size = 0;
error = VOP_SETATTR(vp, vap, td->td_ucred, td);
vn_finished_write(mp);
if (error)
goto bad;
}
error = VOP_OPEN(vp, fmode, td->td_ucred, td);
if (error)
goto bad;
/*
* Make sure that a VM object is created for VMIO support.
*/
if (vn_canvmio(vp) == TRUE) {
if ((error = vfs_object_create(vp, td, td->td_ucred)) != 0)
goto bad;
}
if (fmode & FWRITE)
vp->v_writecount++;
/*
* end of vn_open code
*/
if ((error = falloc(td, &nfp, &indx)) != 0) {
if (fmode & FWRITE)
vp->v_writecount--;
goto bad;
}
fp = nfp;
/*
* Hold an extra reference to avoid having fp ripped out
* from under us while we block in the lock op
*/
fhold(fp);
nfp->f_data = (caddr_t)vp;
nfp->f_flag = fmode & FMASK;
nfp->f_ops = &vnops;
nfp->f_type = DTYPE_VNODE;
if (fmode & (O_EXLOCK | O_SHLOCK)) {
lf.l_whence = SEEK_SET;
lf.l_start = 0;
lf.l_len = 0;
if (fmode & O_EXLOCK)
lf.l_type = F_WRLCK;
else
lf.l_type = F_RDLCK;
type = F_FLOCK;
if ((fmode & FNONBLOCK) == 0)
type |= F_WAIT;
VOP_UNLOCK(vp, 0, td);
if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
/*
* The lock request failed. Normally close the
* descriptor but handle the case where someone might
* have dup()d or close()d it when we weren't looking.
*/
FILEDESC_LOCK(fdp);
if (fdp->fd_ofiles[indx] == fp) {
fdp->fd_ofiles[indx] = NULL;
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
} else
FILEDESC_UNLOCK(fdp);
/*
* release our private reference
*/
fdrop(fp, td);
return(error);
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
}
if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0))
vfs_object_create(vp, td, td->td_ucred);
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
td->td_retval[0] = indx;
return (0);
bad:
vput(vp);
return (error);
}
/*
* Stat an (NFS) file handle.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstat_args {
struct fhandle *u_fhp;
struct stat *sb;
};
#endif
int
fhstat(td, uap)
struct thread *td;
register struct fhstat_args /* {
syscallarg(struct fhandle *) u_fhp;
syscallarg(struct stat *) sb;
} */ *uap;
{
struct stat sb;
fhandle_t fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t));
if (error)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
error = vn_stat(vp, &sb, td);
vput(vp);
if (error)
return (error);
error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
return (error);
}
/*
* Implement fstatfs() for (NFS) file handles.
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstatfs_args {
struct fhandle *u_fhp;
struct statfs *buf;
};
#endif
int
fhstatfs(td, uap)
struct thread *td;
struct fhstatfs_args /* {
syscallarg(struct fhandle) *u_fhp;
syscallarg(struct statfs) *buf;
} */ *uap;
{
struct statfs *sp;
struct mount *mp;
struct vnode *vp;
struct statfs sb;
fhandle_t fh;
int error;
/*
* Must be super user
*/
error = suser(td);
if (error)
return (error);
if ((error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
return (error);
mp = vp->v_mount;
sp = &mp->mnt_stat;
vput(vp);
if ((error = VFS_STATFS(mp, sp, td)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
if (suser(td)) {
bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
sp = &sb;
}
return (copyout(sp, SCARG(uap, buf), sizeof(*sp)));
}
/*
* Syscall to push extended attribute configuration information into the
* VFS. Accepts a path, which it converts to a mountpoint, as well as
* a command (int cmd), and attribute name and misc data. For now, the
* attribute name is left in userspace for consumption by the VFS_op.
* It will probably be changed to be copied into sysspace by the
* syscall in the future, once issues with various consumers of the
* attribute code have raised their hands.
*
* Currently this is used only by UFS Extended Attributes.
*/
int
extattrctl(td, uap)
struct thread *td;
struct extattrctl_args *uap;
{
struct vnode *filename_vp;
struct nameidata nd;
struct mount *mp, *mp_writable;
char attrname[EXTATTR_MAXNAMELEN];
int error;
/*
* SCARG(uap, attrname) not always defined. We check again later
* when we invoke the VFS call so as to pass in NULL there if needed.
*/
if (SCARG(uap, attrname) != NULL) {
error = copyinstr(SCARG(uap, attrname), attrname,
EXTATTR_MAXNAMELEN, NULL);
if (error)
return (error);
}
/*
* SCARG(uap, filename) not always defined. If it is, grab
* a vnode lock, which VFS_EXTATTRCTL() will later release.
*/
filename_vp = NULL;
if (SCARG(uap, filename) != NULL) {
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, filename), td);
if ((error = namei(&nd)) != 0)
return (error);
filename_vp = nd.ni_vp;
NDFREE(&nd, NDF_NO_VP_RELE | NDF_NO_VP_UNLOCK);
}
/* SCARG(uap, path) always defined. */
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
mp = nd.ni_vp->v_mount;
error = vn_start_write(nd.ni_vp, &mp_writable, V_WAIT | PCATCH);
NDFREE(&nd, 0);
if (error) {
if (filename_vp != NULL)
vput(filename_vp);
return (error);
}
if (SCARG(uap, attrname) != NULL) {
error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
SCARG(uap, attrnamespace), attrname, td);
} else {
error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
SCARG(uap, attrnamespace), NULL, td);
}
vn_finished_write(mp_writable);
/*
* VFS_EXTATTRCTL will have unlocked, but not de-ref'd,
* filename_vp, so vrele it if it is defined.
*/
if (filename_vp != NULL)
vrele(filename_vp);
return (error);
}
/*-
* Set a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct mount *mp;
struct uio auio;
struct iovec aiov;
ssize_t cnt;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
if (nbytes > INT_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
cnt = nbytes;
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio,
td->td_ucred, td);
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
done:
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
int
extattr_set_file(td, uap)
struct thread *td;
struct extattr_set_file_args *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_set_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
SCARG(uap, data), SCARG(uap, nbytes), td);
vrele(nd.ni_vp);
return (error);
}
int
extattr_set_fd(td, uap)
struct thread *td;
struct extattr_set_fd_args *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = extattr_set_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
SCARG(uap, nbytes), td);
fdrop(fp, td);
return (error);
}
/*-
* Get a named extended attribute on a file or directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", userspace buffer
* pointer "data", buffer length "nbytes", thread "td".
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
void *data, size_t nbytes, struct thread *td)
{
struct uio auio;
struct iovec aiov;
ssize_t cnt;
size_t size;
int error;
VOP_LEASE(vp, td, td->td_ucred, LEASE_READ);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
/*
* Slightly unusual semantics: if the user provides a NULL data
* pointer, they don't want to receive the data, just the
* maximum read length.
*/
if (data != NULL) {
aiov.iov_base = data;
aiov.iov_len = nbytes;
auio.uio_iov = &aiov;
auio.uio_offset = 0;
if (nbytes > INT_MAX) {
error = EINVAL;
goto done;
}
auio.uio_resid = nbytes;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
cnt = nbytes;
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio,
NULL, td->td_ucred, td);
cnt -= auio.uio_resid;
td->td_retval[0] = cnt;
} else {
error = VOP_GETEXTATTR(vp, attrnamespace, attrname, NULL,
&size, td->td_ucred, td);
td->td_retval[0] = size;
}
done:
VOP_UNLOCK(vp, 0, td);
return (error);
}
int
extattr_get_file(td, uap)
struct thread *td;
struct extattr_get_file_args *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_get_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
SCARG(uap, data), SCARG(uap, nbytes), td);
vrele(nd.ni_vp);
return (error);
}
int
extattr_get_fd(td, uap)
struct thread *td;
struct extattr_get_fd_args *uap;
{
struct file *fp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = extattr_get_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
SCARG(uap, nbytes), td);
fdrop(fp, td);
return (error);
}
/*
* extattr_delete_vp(): Delete a named extended attribute on a file or
* directory
*
* Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
* kernelspace string pointer "attrname", proc "p"
* Returns: 0 on success, an error number otherwise
* Locks: none
* References: vp must be a valid reference for the duration of the call
*/
static int
extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
struct thread *td)
{
struct mount *mp;
int error;
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, td->td_ucred,
td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
int
extattr_delete_file(td, uap)
struct thread *td;
struct extattr_delete_file_args *uap;
{
struct nameidata nd;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return(error);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
if ((error = namei(&nd)) != 0)
return(error);
NDFREE(&nd, NDF_ONLY_PNBUF);
error = extattr_delete_vp(nd.ni_vp, SCARG(uap, attrnamespace),
attrname, td);
vrele(nd.ni_vp);
return(error);
}
int
extattr_delete_fd(td, uap)
struct thread *td;
struct extattr_delete_fd_args *uap;
{
struct file *fp;
struct vnode *vp;
char attrname[EXTATTR_MAXNAMELEN];
int error;
error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
NULL);
if (error)
return (error);
if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
vp = (struct vnode *)fp->f_data;
error = extattr_delete_vp((struct vnode *)fp->f_data,
SCARG(uap, attrnamespace), attrname, td);
fdrop(fp, td);
return (error);
}
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